I've been deveoping an android app (using ChatGPT - I have no real android development knowledge!) which animates a dog's mouth through the camera feed. I had the app working okay but with some latency between the camera feed and the overlay (using CameraX and a PreviewView), so I tried to update it to an offscreen rendering approach, using an EGL context and MediaCodec surface to render the camera feed plus overlays into a single composited output.
However, the I have not implemented this correclty and the camera feed is just showing a black screen.
Here's ChatGPT's summary of what we had originally (working) and what we changed it to. Both of these approaches are saved on different github branches which you will have access to. You can see the previously working version on the master branch, and the newly updated (not working) version on a test branch.
What We Had Originally - An Android app (Kotlin) using CameraX and a PreviewView to display the live camera feed. - A BoundingBoxOverlay custom View drawn on top for YOLO pose detection (dog’s mouth, eyes, etc.). - We wanted to animate the dog’s mouth in sync with audio but were limited by the traditional overlay.
What We Changed It To Offscreen Rendering Approach: - Created an EGL context and MediaCodec surface (via OffscreenRenderer.kt) to render the camera feed plus overlays into a single composited output. - The camera feed is now provided by a SurfaceTexture created from an external OES texture (rather than using PreviewView). - CameraX is configured to output frames to that SurfaceTexture. - A custom pipeline composites the camera and any overlays (animated mouth, etc.) in OpenGL, then encodes to a video file with MediaCodec.
What We’re Trying to Achieve A Snapchat-like pipeline: - Grab the camera feed directly via a SurfaceTexture (external OES texture). - Apply real-time overlays/filters (like mouth animation, hats, glasses) in OpenGL. - Composite everything offscreen and encode it into a video file (for recording). - Avoid the performance constraints of standard Android Views by relying on OpenGL compositing (similar to Snapchat filters).
Despite these changes, the feed currently displays a black screen. We suspect an issue with the GL pipeline, resolution mismatch, or camera frames not drawing as intended.
Goal: Fix the offscreen renderer so that camera frames plus overlays appear in real time, and video recording also works as expected.
Sk sumit brande Category: Android, Android App Development, Cloud Computing, Database Management, Java, Kotlin, Mobile App Development, PHP, UI / User Interface, User Experience Research Budget: ₹100 - ₹400 INR
14-Jan-2026 05:00 GMT
Shopify Theme Version Upgrade -- 2 Category: HTML, Shopify, Shopify Development, Shopify Templates, Web Development, Web Design, Website Management, Website Optimization Budget: $30 - $250 USD
14-Jan-2026 04:57 GMT
PDF Data Entry to Google Sheets Category: Data Analysis, Data Cleansing, Data Collection, Data Entry, Data Extraction, Data Management, Data Processing, Excel, Google Sheets, PDF Budget: $15 - $25 USD
Data Entry & Editing Cleanup Category: Content Writing, Data Entry, Data Management, Data Processing, Editing, Excel, Proofreading, Word Processing Budget: $15 - $25 USD
Traditional Saree Showcase Video Category: 3D Animation, After Effects, Animation, Cinematography, Video Editing, Video Services, Voice Acting, Voice Over Budget: ₹600 - ₹1500 INR
